header {
    background: url(../img/header.jpg) top center no-repeat;
    background-size: cover;
    height: 280px;
    position: relative;
    overflow: hidden;
}

header .logo {
    width: 1100px;
    margin: 40px auto;
}

.content {
    background: url(../img/main_bg.jpg) top center;
    /* background-size: cover; */
    width: 100%;
}

.content .inner_content {
    width: 1100px;
    margin: 0 auto;
    background-color: #fff;
}

nav {
    background: url(../img/nav_bg.jpg);
    /* background-size: cover; */
    height: 35px;
    position: relative;
    z-index: 999;
}

nav ul {
    width: 1100px;
    margin: 0 auto;
}

nav ul li {
    float: left;
}

nav ul li a {
    display: inline-block;
    height: 35px;
    width: 100px;
    line-height: 35px;
    color: #fff;
    text-align: center;
    font-size: 14px;
}

nav ul li a.active {
    background: url(../img/nav_current.jpg);
}

footer {
    background: url(../img/bottom_bg.jpg) no-repeat;
    background-size: 100% 100%;
}

footer .footer_inner {
    width: 1100px;
    margin: 0 auto;
    padding-top: 20px;
}

.footer_inner .footer_one {
    display: flex;
}

.footer_inner h3 {
    color: red;
    font-size: 14px;
}

.footer_inner h1 {
    color: red;
    font-weight: bold;
    font-size: 28px;
}

.footer_inner .f_right {
    margin-left: 160px;
}

.footer_two {
    margin-top: 30px;
    text-align: center;
    background: url(../img/help-link-bg.gif) repeat-x;
    padding: 10px 0;
}

.footer_three {
    text-align: center;
    line-height: 30px;
}

.nav li {
    position: relative;
}

.nav li .subnav {
    display: none;
    position: absolute;
    left: 0;
}
.nav ul{
    list-style: none!important;
    padding: 0;
}
.nav>ul>li:hover .subnav {
    display: flex;
    flex-direction: column;
}

.nav>ul>li a:hover {
    background: url(../img/nav_current.jpg);
}

.subnav>li {
    height: 40px;
    background-color: #ffffff;
    line-height: 40px;
    width: 120px;
    text-align: center;
    background: rgb(200, 11, 11);
    color:#fff;
}
.subnav>li:hover{
    background: rgb(156, 11, 11);
}
li:hover .subnav {
    height: 240px;
}